Establishments operating without a mine or quarry and primarily engaged in crushing, grinding, pulverizing, or otherwise preparing clay, ceramic, and refractory minerals; barite; and miscellaneous nonmetallic minerals, except fuels. These minerals are the crude products mined by establishments of Industry Group 145, and Industry Group 149, and by those of Industry 1479, mining barite. Also …
Examples: Barite, ground or otherwise treated, Barium, ground or otherwise treated, Blast furnace slag, Clay for petroleum
